Curtain Size Converter
Calculate curtain width from window size using fullness ratios, plus rod length guidance.
Enter your window width and choose a fullness ratio.
Enter a window width to see results.
Curtains need to be wider than the window to look full and pleated.
Fullness ratio determines how gathered the curtains look:
- 1.5x = flat/casual look (minimal gathering)
- 2x = standard fullness (most common)
- 2.5x = full/luxurious look
- 3x = very full/formal (pinch pleats)
Curtain width formula:
- Total curtain width = window width × fullness ratio
Rod length guidelines:
- Rod should extend 8–12 inches (20–30 cm) beyond each side of the window
- This makes the window appear larger and allows curtains to stack off the glass
Example (metric):
- Window width: 150 cm
- Fullness: 2x
- Total curtain fabric: 150 × 2 = 300 cm
- Rod length: 150 + 20 + 20 = 190 cm
Example (imperial):
- Window width: 60 inches
- Fullness: 2x
- Total curtain fabric: 60 × 2 = 120 inches
- Rod length: 60 + 10 + 10 = 80 inches
For two panels, divide the total width by 2.